cvs commit: src/sys/conf files src/sys/ddb db_ps.c src/sys/kern kern_condvar.c kern_sig.c kern_synch.c kern_thread.c sched_4bsd.c sched_ule.c sys_generic.c vfs_subr.c src/sys/sys condvar.h proc.h sched.h systm.h

[John Baldwin]

jhb         2004/02/27 10:52:44 PST

  FreeBSD src repository

  Modified files:
    sys/conf             files 
    sys/ddb              db_ps.c 
    sys/kern             kern_condvar.c kern_sig.c kern_synch.c 
                         kern_thread.c sched_4bsd.c sched_ule.c 
                         sys_generic.c vfs_subr.c 
    sys/sys              condvar.h proc.h sched.h systm.h 
  Log:
  Switch the sleep/wakeup and condition variable implementations to use the
  sleep queue interface:
  - Sleep queues attempt to merge some of the benefits of both sleep queues
    and condition variables.  Having sleep qeueus in a hash table avoids
    having to allocate a queue head for each wait channel.  Thus, struct cv
    has shrunk down to just a single char * pointer now.  However, the
    hash table does not hold threads directly, but queue heads.  This means
    that once you have located a queue in the hash bucket, you no longer have
    to walk the rest of the hash chain looking for threads.  Instead, you have
    a list of all the threads sleeping on that wait channel.
  - Outside of the sleepq code and the sleep/cv code the kernel no longer
    differentiates between cv's and sleep/wakeup.  For example, calls to
    abortsleep() and cv_abort() are replaced with a call to sleepq_abort().
    Thus, the TDF_CVWAITQ flag is removed.  Also, calls to unsleep() and
    cv_waitq_remove() have been replaced with calls to sleepq_remove().
  - The sched_sleep() function no longer accepts a priority argument as
    sleep's no longer inherently bump the priority.  Instead, this is soley
    a propery of msleep() which explicitly calls sched_prio() before
    blocking.
  - The TDF_ONSLEEPQ flag has been dropped as it was never used.  The
    associated TDF_SET_ONSLEEPQ and TDF_CLR_ON_SLEEPQ macros have also been
    dropped and replaced with a single explicit clearing of td_wchan.
    TD_SET_ONSLEEPQ() would really have only made sense if it had taken
    the wait channel and message as arguments anyway.  Now that that only
    happens in one place, a macro would be overkill.
  
  Revision  Changes    Path
  1.866     +1 -0      src/sys/conf/files
  1.50      +2 -16     src/sys/ddb/db_ps.c
  1.46      +46 -295   src/sys/kern/kern_condvar.c
  1.271     +7 -16     src/sys/kern/kern_sig.c
  1.243     +81 -217   src/sys/kern/kern_synch.c
  1.171     +7 -11     src/sys/kern/kern_thread.c
  1.34      +2 -2      src/sys/kern/sched_4bsd.c
  1.100     +2 -2      src/sys/kern/sched_ule.c
  1.129     +3 -8      src/sys/kern/sys_generic.c
  1.484     +2 -7      src/sys/kern/vfs_subr.c
  1.10      +0 -9      src/sys/sys/condvar.h
  1.369     +2 -7      src/sys/sys/proc.h
  1.11      +1 -1      src/sys/sys/sched.h
  1.204     +0 -1      src/sys/sys/systm.h